Improvement in portable tool-rests



O. OLSEN. Portable Tool-Rests.

No. 210,957. Patented Dec 17,1878.

minessem wait UNITED STATES PATENT QFFIoE.

OLE OLSEN, OF OHRISTIANIA, NORWAY.

IMPROVEMENT IN PORTABLE TOOL-RESTS.

Specification forming part of Letters Patent No. 210,957, dated December17, 1878 application filed October 16, 1878.

To all whom it may concern:

Be it known that I, OLE OLSEN, of Christiania, in the county ofAggerhuus and Kingdom of Norway, have invented certain new and usefulImprovements in Portable Tool-Rests; I

' portable tool-rests, for the purpose of holding edgc'tools in. theirproper posit-ions, so as to obtain the desired bevel during the processof grinding and sharpening them; and my invention consists of thecombination, with a clamp having a side openingfor the reception of thetool that is to be ground, of a set-screw for securin g the tooltemporarily inposition in the said clamp, and a roller located inbearings on the under side of the said clamp, which roller rotatesfreely when laid in contact with a revolving grindstone; and by thissimple apparatus any unskilled person will be enabled to sharpen andproperly bevel edge-tools of any kind equally as well as the most expertperson. All that is required to do is to secure the edge-tool within theclamp in a position according to the desired bevelthat is, the tool isplaced in the clamp so that its out-- ting-edge shall extend farther outfrom the side of the clamp in grinding sharp bevels, and farther back ingrinding more obtuse ones.

\Vhen the tool. is secured within the clamp, the edge of the tool, aswell as the loosely-revolving roller beneath, is held in contact withthe rotary grindstone, by which Iobtain a true bevel, no matter howeccentric the grindstone may be.

This invention is equally useful in holding the tool when it is drawn onthe oil'stone, or when ground on emery-wheels, &c.

I am aware of Letters Patent granted to 0. Banks, May 31, 1870, No.103,739, in which a swivel caster-frame is jointed to a slottedframe forholding the tool, which frame is closed on four sides, and I wish tostate that I do not claim such an arrangement and construction as myinvention.

I make the toolcarrying frame open on one side, as described, so thatthe tool can be inserted sidewise, by which the edge of the tool is notliable to come in contact with such frame during the act of inserting ittherein. The roller is located in hearin gs firmly secured or made inone piece with the tool-holder, by which great accuracy is obtained ingrinding the tool. The roller is located in said hearings directlyunderneath the tool-holder, by which arrangement the roller and the edgeof the tool to be ground are brought closer together, so as to enable meto grind tools more accurately, especially if the grindstone is ofirregular shape.

On the accompanying drawing, Figure 1 represents a side elevation of myinvention; and Fig. 2 represents a central longitudinal section on theline A B, shown in Fig. 1.

Similar letters refer to similar parts when ever they occur on thedrawings.

a represents an ordinary planentool, that is inserted within the sideopening, b, as shown, which opening is made in the metallic clamp 0. clis a set-screw for holding the tool, as shown, which set-screw isinserted through the upper forward end of the clamp c. c 0 representbearings beneath the clamp c, for the looselyrevolving guide-rollerf. 5represents a portion of the grindstox'xe, as usual.

What I wish to secure by Letters Patent, and claim, is

The herein-described tool-clamp for grinding tools, consisting of theframe 0, with its side opening, 0, for the insertion of the tool in alateral direction, set-screw d, and stationary bearings e e, for theloosely -rotatin g roller f, all arranged and combined substantially asand for the purpose set forth.

In testimony that I claim the foregoing as my own invention I haveattired my signature in presence of two witnesses.

OLE OLSEN.

Witnesses:

ALBAN ANDREN, Enw. J. OLSEN.

